REGIONAL-SCALE BOUNDARY-LAYER OZONE VARIATIONS IN THE EASTERN UNITED-STATES AND THEIR ASSOCIATION WITH METEOROLOGICAL VARIATIONS

Four regions (north, northeast, south, and southeast regions) were est ablished in the eastern United States to study the variation of the di urnal maximum ozone concentration (DMOC) at the surface with the varia tion of certain surface meteorological parameters over two 31 day peri ods, 15 June to 15 July 1990 and 1-31 July 1988. The DMOC variations i n the south region were different from those in the north, northeast, and southeast regions. In the north, northeast, and southeast regions, ozone increases and decreases occurred almost simultaneously, whereas in the south region, ozone variations were often out of phase with th e other regions. The north, northeast, and southeast regions were dire ctly affected by the same migratory high-pressure systems, if not simu ltaneously at least consecutively; but these high-pressure systems sel dom moved directly into the south region. The south region was affecte d either by the peripheral regions of these high-pressure systems or b y the weak and not well-organized migratory systems that had very litt le influence in the north, northeast, and southeast regions.